code: def select_device(dev, close=True):
      """
      Use numbas numba to select the given device, optionally
      closing and opening up a new cuda context if it fails.
      :param dev: int device to select
      :param close: bool close the cuda context and create new one?
      """
      if numba_cuda.get_current_device().id != dev:
          logging.warning("Selecting device " + str(dev))
          if close:
              numba_cuda.close()
          numba_cuda.select_device(dev)
          if dev != numba_cuda.get_current_device().id:
              logging.warning(
                  "Current device "
                  + str(numba_cuda.get_current_device())
                  + " does not match expected "
                  + str(dev)
              )
  
imports: from threading import Lock
  from asyncio import InvalidStateError
  from cuml.internals.import_utils import check_min_dask_version
  from cuml.common import device_of_gpu_matrix
  from dask.distributed import default_client, wait
  import time
  import random
  import dask
  import logging
  import os
  from cuml.internals.safe_imports import gpu_only_import
label_desc: Use image node_id 4 for calling a global function with example usage: select_device(dev, close) without return types